CN101022531A - Digital TV user authentication system based on mobile device - Google Patents
Digital TV user authentication system based on mobile device Download PDFInfo
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Abstract
A user certification system of digital TV based on mobile device comprises front end unit arranged on server, receiver arranged at user home and mobile unit containing service cipher key. It is featured as using said front end unit to scramble and encipher data, using said receiver as set-top box for carrying out decoding on channel and source, and using mobile unit set with authorized service cipher key to descramble TV program.
Description
Technical field
The present invention relates to technical field of digital television set-top, be specifically related to the digital TV user authentication technology, the invention still further relates to the radio spread spectrum communication technical field in addition.
Background technology
The nineties later stage, because the quantity that Adds User of cable TV is progressively saturated, the user can pass through cable TV network, enjoys services such as communication, amusement, information, product, expand based on this service, we need collect red-letter day reception fee with and the information service expense.Owing to accept service class difference, tuned television channel difference, watch the Pgmtime difference, how scientifically to collect the program reception fee and use and the information service expense, this problem is also just put in face of us.
Make a general survey of the technical development process of charging administration system, mainly be divided into two historical stages of analogue technique and digital technology:
First stage: be based on analogue technique,, analog signal carried out scrambling, have only the user that descrambler has been installed normally to watch at front end in order to realize effective charge of cable TV.Such system can control the descrambler switch of unique user by the addressing of front end.System can realize full frequency band scrambling and channel scrambling, and technology such as the method for realization normally adopts the video paraphase, horizontal synchronization is overlapping, vertical synchronization is overlapping, the shake of digital random video line can produce loss and distortion to signal usually.
Second stage: the condition receiving system that produces along with the appearance of digital technology, basic principle are the methods that adopts scrambling control word encrypted transmission, and user side utilizes the IC-card deciphering.Because what adopt is digital technology, and signal is not had loss, the confidentiality of system, reliability all improve greatly.To the scrambling of transport stream, oneself has standard DVB; Cryptographic algorithm to control word generally adopts RSA and 3DES algorithm.
Cable digital TV charge system technology is because different to encryption system, and system's difference of different manufacturers is very big, and its technology has three kinds substantially:
(1) addressable custom system.For user's charge in the solution cable television system, network synthesis management, network value added design.Utilize multifunction system software,, or subscriber signal carried out scrambling, guarantee that with this cable TV subscriber in time pays dues by the break-make of all user input signals in the operational computations machine control cable TV network; By scientific design, thereby reach the purpose of network value added, improve the efficiency of management and level addressing distributor and system operating software in the addressing system equipment.
(2) digital interference blanking system.This system has adopted capable cutting rotation signal scrambling technique mode, integrated central control technology, and digital processing technology, integrated circuit technique, the software application control technology makes system possess powerful and perfect management function and fail safe.System's characteristics are to adopt the centralized control authorization, can be controlled to each user, each pay per channel.But compatible extensions is poor, and investment is big.
(3) condition receiving system.Partly form by scrambler, descrambler, encryption equipment, control word generator, SAS Subscriber Authorization System, Subscriber Management System etc.System should be able to guarantee that the user pays dues on time to effective management of user's implementation, and clear reflection user's charge situation can also be carried out distributed data base administration, to realize that differently numeric field data is relatively independent and unified.
The present invention is mainly concerned with condition and accepts system.
Along with popularizing and the development of IT application in the national economy of Computer Applied Technology, customer, distributed treatment, Internet (Internet), in-house network technology such as (Intranet) are widely accepted and use, and the networking requirement of computer enlarges rapidly.In many Computer Networking, wireless network (Wireless Network) with its need not wiring, in advantages such as the roaming of certain zone, operating cost are cheap, the irreplaceable effect of other networking technologies is arranged in many application scenarios, and in wireless communication technology, based on the computer radio netting gear of spread spectrum have antijamming capability strong, be easy to realize code division multiple access, safe and secret, need not the demand frequency resource etc. characteristics, the every field in computer networking has all obtained using widely in recent years.
Spread spectrum communication has the incomparable advantage of other modes, is used more and more widely in radio communication in recent years.Spread spectrum communication (Spread Spectrum Communications) begins to appear at World War II, as the wireless private communication technology of U.S. army's use.Spread spectrum is widely used in comprising many fields such as computer radio net now.Spread spectrum communication is a kind of mode of intelligence transmission, and the shared frequency bandwidth of its signal is much larger than the essential minimum bandwidth of transmitted breath; The broadening of frequency band is to realize by the method for encoding and modulate, and is irrelevant with the information that is passed; Adopting identical spreading code to carry out correlation demodulation at receiving terminal separates to extend to and recovers transmitted breath.
Spread spectrum communication has following characteristics: strong interference immunity, and good concealment, anti-multipath disturbs, the traffic rate height (2M, 8M, 11Mbps), and need not the demand frequency resource, networking is simple, and network performance is good or the like.With X.25 compare with DDN, the wireless frequency expansion netting gear has the speed height, and (2Mbps, 8Mbps 11Mbps), install simply, and operating cost low (need not hire charge, only drop into a small amount of maintenance cost) need not the demand frequency resource, expands advantages such as small investment easily.In addition, as use X.25 or DDN as the link of interconnection between net, to use equipment such as router, multiplexer at both link ends, and the wireless frequency expansion product has multiple choices such as bridge, router, modulator-demodulator, saving equipment and investment, so the wireless frequency expansion net is than X.25 at hundreds of kilometer range Intranet remarkable advantages being arranged with DDN.
Summary of the invention
A lot of deficiencies based on former technology, the present invention designs a digital TV user authentication system based on mobile device, just digital TV conditional is accepted system, is used to manage the problem owing to service difference that the user receives, TV reception difference, the different differences charges that bring of time period watched.
A kind of digital TV user authentication system based on mobile device, it comprises the front end system that is arranged in server, is arranged in receiver (being equivalent to set-top box) in the user family and the mobile device that comprises business cipher key.
Described front end system design mainly comprises program management system, Subscriber Management System, Database Systems, encryption device or module, scrambling equipment etc., mainly finishes scrambling, the encrypted work of data, and the front end system that front end system and TV office use is similar.
Described receiver is equivalent to a digital TV set-top box, mainly comprise several major parts of signal processing, control and interface, the TV programme signal that main receiving front-end transmits, realize channel and source coding, finish the descrambling of programme signal with the portable terminal cooperation that the user uses, thereby make the user can see the TV programme of having authorized.
The mobile device that described user uses has mainly stored the business cipher key of having authorized, be mainly used in the descrambling TV programme, mobile device uses the radio spread spectrum communication technology to be connected with receiving terminal, the in store business cipher key that is used for the descrambling program in the mobile device, this key must be that the user registers in Radio ﹠ Television Bureau, and authorized can the acquisition.
Workflow of the present invention is as follows:
At front end, condition receiving system provides an Entitlement Control Message ECM (Entitle ControlMessage) generator, and it is attached to access conditions and control word among the ECM under the program.Under few situation, it also provides control word generator and scrambler.Can be by the access conditions that the network operator edits by the Play System editor, they can be combined in the electronic program guides together.And, for being inserted into, transmits in the stream Entitlement Management Message EMM (Entitle Manage Message), the EMM generator can be connected on the front end.The EMM generator is the combination of Subscriber Management System and authentication management system, and the former is regarded as their commercial interface by the user, and the latter produces and broadcasting EMM terminal in transmitting stream.
Front end relates to two encryption systems, and one is the program encryption system, and the programme content that broadcasts is encrypted, and is called scrambling traditionally, and its effect is to upset programme signal, makes that unwarranted user can not the watching encrypted program.Another encryption system is the hierarchical encryption encryption system, its objective is to use closely linked level to encrypt the safety of protection control word.Scrambling for program, we adopt DVB Common Scrambling algorithm, the algorithm that is based on key that this scrambling algorithm uses, control key is CW, in order to guarantee the safe and reliable of scrambling, the common 5-10 of CW changes once second, and guarantee sufficient randomness, resist hacker's attack effectively, because front end has adopted the common scrambling algorithm of standard, for the unification of receiving equipment provides the foundation, as long as receiving equipment has been equipped with same Descrambling Algorithms, and finished the CA system integration, promptly possessed the condition of watching scrambled program, if there is mandate can watch scrambled program.
After receiver received the TS stream of scrambled program, the parameter that the mobile device that uses according to the user provides filtered out ECM, EMM message, and according to certain rule request with ECM, EMM message sends mobile device to.Mobile device receives ECM, after the EMM message, respectively to its processing of being correlated with, mandate is write the user authorization data district of mobile device, and solves scrambling control word CW according to the key of authorising conditional and appointment, sends CW to receiving terminal simultaneously.After receiving terminal receives CW, send it to descrambler, if descrambled control words CW is correct, then can solve scrambled program, otherwise will watch less than program.
The mobile device that the user uses is similar to the smart card in the original set-top box, uses the radio spread spectrum communication technology to be connected with receiving terminal.The in store business cipher key that is used for the descrambling program in the mobile device (for example mobile phone), this key must be that the user registers in Radio ﹠ Television Bureau, and authorized can the acquisition.
Maximum beneficial effect of the present invention is: the intelligent card function of digital TV set-top box is transplanted on the mobile device, has been realized the separation between machine and card of set-top box and smart card, so just separated the charging administration system and the Program Receive System of Digital Television.Because each place Digital Television condition of acceptance is different, the set-top box of various places can not be compatible, so manufacturer can not the large-scale production set-top box, makes the set-top box cost high.Realized the condition receiving system of " separation between machine and card ", will help the large-scale production of set-top box, cost reduces, and the user can select different brands and performance.
Description of drawings
Fig. 1 is the general frame figure of customer certification system;
Fig. 2 is the high composition of the hardware of receiver;
Fig. 3 is the program descrambling schematic diagram of customer certification system.
Embodiment
Below in conjunction with accompanying drawing the present invention is further set forth.
As shown in Figure 1, whole digital TV user authentication system comprises three major parts: front end, receiving terminal and mobile device.
The front end system design mainly comprises program management system, Subscriber Management System, Database Systems, encryption device or module, scrambling equipment etc.We are sent to digitized program in multiplexing/scrambler by the data serial interface earlier, in order to make the Subscriber Management System can operate as normal, must in multiplexing/scrambler, finish every initial setting up in advance, make Subscriber Management System set up communication with multiplexing/scrambler and be connected, and set up relevant PMT, CAT table etc. by standard interface.
Multiplexing/as when scrambler begins scrambling, at first, to produce control word CW by security algorithm by control word generator according to the mandate requirement of playing programs, control scrambler by it the MPEG-2 transmission stream from multiplexer is carried out scrambling.The word length of control word CW is generally 60bit, and for the sake of security, every 5-20 changes once second.And before using CW scrambling TS stream, earlier send CW to ECMG by standard interface, and wait for that ECMG returns ECM message, this ECM message is encapsulated into CW and relevant program attribute information in the packet with the ciphertext form, multiplexing/scrambler receive ECM bag and by SCS synchronously after, according to specific sequential relationship ECM is inserted in the middle of the TS stream, send CW to scrambling module, and scrambling module uses the relevant video-audio program of CW scrambling according to the rule of reserving in advance in advance.Multiplexer also can be inserted into EMM message, the SI information of having received in the TS stream simultaneously, and the multiplexing good TS stream that comprises ECM.EMM and SI is sent in the modulator by the ASI interface, be sent to user side then, so far finished the scrambling Control work of front end.
At user side, mainly form by receiver (set-top box) and mobile device (as mobile phone).Wherein the structure of receiver mainly comprises two modules of channel-decoding and source coding as shown in Figure 2.The user buys after the digital television program, will obtain a business cipher key, and this key can be stored in the storage card the inside of mobile device.When the user prepares to teleview, at first use mobile device to receive receiver by wireless frequency expansion technical battery.
After receiver received the TS stream of scrambled program, the parameter that provides according to user's mobile device filtered out ECM, EMM message, and according to certain rule request with ECM, EMM message sends mobile device to.Mobile device receives ECM, after the EMM message, respectively to its processing of being correlated with, mandate is write the user authorization data district of mobile device, and solves scrambling control word CW according to the key of authorising conditional and appointment, sends CW to receiver simultaneously.After receiver receives CW, send it to descrambler, if descrambled control words CW is correct, then can solve scrambled program, otherwise will watch less than program.
In the receiver received signal, because ECM and EMM signal are placed on the fixed position of MPEG-2 transport stream packet, therefore, demodulation multiplexer just is easy to solve ECM and EMM signal.Obtain ECM and EMM information the transmission stream that receiver at first obtains after demodulation, it is right secondly to finish with distributing key in mobile device; The EMM deciphering obtains business cipher key SK, with business cipher key ECM is deciphered then, and controlled word and Control Parameter recover control word CW, and it are delivered to descrambler carry out descrambling.As seen, the fail safe of whole digital television broadcasting CA system has obtained triple protection (as shown in Figure 3).
The first heavily protection: utilize control word that image, voice and data are carried out scrambling.Image, voice and data are carried out scrambling, make the receiver that does not have authorized user can't carry out descrambling, can not normally watch program.
The second heavily protection: utilize business cipher key that Entitlement Control Message ECM is encrypted.The safety of control word transmits and relies on business cipher key, and the set-top box of user side only after obtaining business cipher key prevailing for the time being in force, could be deciphered ECM, thereby obtains control word CW.Even control word is stolen in sending user's process to like this, the thief also can't be decrypted the control word of encrypting.
Triple protection: utilize distributing key that Entitlement Management Message EMM is encrypted.Encryption makes that the fail safe of whole system is stronger to EMM, unauthorized user is made under the situation of the Entitlement Management Message that obtains encrypting shortly, owing to can not get distributing key, thereby can't decipher EMM, also just can not get business cipher key SK, more can't controlled word, there is not correct control word just can't solve and obtain normal signal.
Claims (2)
1, a kind of digital TV user authentication system based on mobile device, it comprises the front end system that is arranged in server, is arranged in receiver (being equivalent to set-top box) in the user family and the mobile device that comprises business cipher key:
The front end system design mainly comprises program management system, Subscriber Management System, Database Systems, encryption device or module, scrambling equipment etc., mainly finishes scrambling, the encrypted work of data, and the front end system that front end system and TV office use is similar;
Receiver is equivalent to a digital TV set-top box, mainly comprise several major parts of signal processing, control and interface, the TV programme signal that main receiving front-end transmits, realize channel and source coding, finish the descrambling of programme signal with the portable terminal cooperation that the user uses, thereby make the user can see the TV programme of having authorized;
The mobile device that the user uses has mainly stored the business cipher key of having authorized, and is mainly used in the descrambling TV programme.
2, the digital TV user authentication system based on mobile device according to claim 1, it is characterized in that, described mobile device uses the radio spread spectrum communication technology to be connected with receiving terminal, the in store business cipher key that is used for the descrambling program in the mobile device, this key must be that the user registers in Radio ﹠ Television Bureau, and authorized can the acquisition.
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| CNB2006101243561A CN100502496C (en) | 2006-12-22 | 2006-12-22 | Digital TV user authentication system based on mobile device |
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| CNB2006101243561A CN100502496C (en) | 2006-12-22 | 2006-12-22 | Digital TV user authentication system based on mobile device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271285A (en) * | 2011-08-10 | 2011-12-07 | 深圳国微技术有限公司 | Conditional access module and digital television realization method |
| CN103051936A (en) * | 2012-12-25 | 2013-04-17 | 深圳市九洲电器有限公司 | Condition receiving method of set-top box (STB), STB and broadcasting and television server |
| CN101784053B (en) * | 2009-01-16 | 2013-05-08 | 中兴通讯股份有限公司 | Wireless home gateway and television access realizing method thereof |
| CN103338390A (en) * | 2013-05-28 | 2013-10-02 | 武汉丰天信息网络有限公司 | Group adding descrambling charging system anti-piracy method |
| CN103747300A (en) * | 2013-12-02 | 2014-04-23 | 中国传媒大学 | Conditional access system capable of supporting mobile terminal |
| CN104581239A (en) * | 2014-12-19 | 2015-04-29 | 广东九联科技股份有限公司 | Portable smart card terminal and set-top box system |
| CN104683825A (en) * | 2015-02-12 | 2015-06-03 | 央广视讯传媒股份有限公司 | Encrypted transport and decoding processing method of TS (transport stream) |
| CN109275004A (en) * | 2018-11-07 | 2019-01-25 | 深圳Tcl数字技术有限公司 | Digital television signal de-scrambling method, mobile terminal, system and storage medium |
| CN113179425A (en) * | 2020-11-16 | 2021-07-27 | 北京路安世纪文化发展有限公司 | High-speed digital television signal transmission method |
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2006
- 2006-12-22 CN CNB2006101243561A patent/CN100502496C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101784053B (en) * | 2009-01-16 | 2013-05-08 | 中兴通讯股份有限公司 | Wireless home gateway and television access realizing method thereof |
| CN102271285A (en) * | 2011-08-10 | 2011-12-07 | 深圳国微技术有限公司 | Conditional access module and digital television realization method |
| CN103051936A (en) * | 2012-12-25 | 2013-04-17 | 深圳市九洲电器有限公司 | Condition receiving method of set-top box (STB), STB and broadcasting and television server |
| CN103338390A (en) * | 2013-05-28 | 2013-10-02 | 武汉丰天信息网络有限公司 | Group adding descrambling charging system anti-piracy method |
| CN103338390B (en) * | 2013-05-28 | 2016-11-02 | 武汉丰天信息网络有限公司 | One population adding descrambling charging system anti-piracy method |
| CN103747300A (en) * | 2013-12-02 | 2014-04-23 | 中国传媒大学 | Conditional access system capable of supporting mobile terminal |
| CN103747300B (en) * | 2013-12-02 | 2018-06-29 | 中国传媒大学 | A kind of condition receiving system for supporting mobile terminal |
| CN104581239A (en) * | 2014-12-19 | 2015-04-29 | 广东九联科技股份有限公司 | Portable smart card terminal and set-top box system |
| CN104683825A (en) * | 2015-02-12 | 2015-06-03 | 央广视讯传媒股份有限公司 | Encrypted transport and decoding processing method of TS (transport stream) |
| CN109275004A (en) * | 2018-11-07 | 2019-01-25 | 深圳Tcl数字技术有限公司 | Digital television signal de-scrambling method, mobile terminal, system and storage medium |
| CN113179425A (en) * | 2020-11-16 | 2021-07-27 | 北京路安世纪文化发展有限公司 | High-speed digital television signal transmission method |
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